Comparative study of the magnetic behavior of spherical and cubic superparamagnetic iron oxide nanoparticles

Guoliang Zhen, Benjamin Muir, Braford Moffat, Peter Harbour, Keith Murray, Boujemaa Moubaraki, Kiyonori Suzuki, Ian Madsen, Nicki Agron-Olshina, Lynne Waddington, Paul Mulvaney, Patrick Hartley

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A modified method for the production of cubic and spherical superparamagnetic nanoparticles is presented. Cubic nanoparticles can be made that are highly monodisperse down to a diameter of 8 nm. A detailed study is presented of the physical properties of these nanoparticles using high-resolution transmission electron microscopy analysis, X-ray powder diffraction, superconducting quantum interference device measurements, and relaxivity measurements performed in a magnetic resonance imaging scanner. It is found that cubic iron oxide nanoparticles have a higher degree of crystallinity and relaxivity (four times higher) than their spherical counterparts. These novel cubic iron oxide nanoparticles show great promise for use in biomedical imaging applications.
Original languageEnglish
Pages (from-to)327 - 334
Number of pages8
JournalJournal of Physical Chemistry C
Issue number2
Publication statusPublished - 2011

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